Air-pump.



J. J. GILDAY.

AIR PUMP.

APPLICATION FILED ooT. 29,1906.

907,591. I Patented-Dec. 22, 1908.

/6 Z 1a Z Mos Mg JAMES JOSEPH GILDAY, OF BERRINGA, VICTORIA, AUSTRALIA.

AIR-PUMP.

Specification of Letters Patent.

Application filed October 29, 1906.

Patented Dec. 22, 1908.

Serial No. 341,159.

To all whom it may concern:

Be it known that I, JAMES Josnrn GIL- DAY, a subject of the King of Great Britain, residing at Berringa, in the State of Victoria, Australia, miner, have invented an Improved Air-Pu p, Of which the following is a specification.

This invention relates to certain new and useful improvements in air pumps and the object thereof is to provide a ump of such class with means as hereina'ter set forth whereby the air is subjected to little or no frictional resistance during its passage through the pump.

A further object of the invention is to provide an air pump with a rotatable means in a manner as hereinafter set forth which when rotating in one direction acts as a means for drawing the air through the pump butwhen reversed in the op osite direction converts the pump into a ol bwer.

A further object of the invention is to provide an air ump which shall be simple in its construction, strong, durable, efficient in its use, conveniently operated and inexpensive to manufacture.

With the foregoing and other objects in view, the invention consists in the novel construction, combination and arran ement of parts hereinafter more specificsfily described and illustrated in the accompanying drawings wherein is shown the preferred embodiment of the invention, but it is to be understood that changes, variations and modifications can be resorted to which come within the scope of the claims hereunto appended. g

In the drawings :Figure 1 is a longitudinal vertical section through the pump, and F1ig.d2 an enlarged sectional detail of the Referring now to these drawings, 1 represents an external stationary cylinder or. casing provided with flanges 2, 3 at its ends and with a removable flared inlet pipe 4 at the intake end. Within said stationary casing is a revoluble cylinder or liner 5 having therein a screw 6 and a central tapering core or boss 7 said screw and core being formed integral with their cylinder or linen. The core 7 tapers from the outlet to the intake end of the pump and the pitch of the screw increases from the intake end to the outlet as shown in Fig. 1. By this arrangement the width of the annular passage 8 between the core and the cylinder is gradually reduced towards the outlet and the area of the latter is much less than that of the intake, consequently the air is gradually compressed as it passes through the pump and is finally discharged with a greatly increased velocity.

The increasing pitch of the screw is an important feature of the pump as it imparts a throw, the strength of which increases correspondingly with the compression of the air in the cylinder. 'The front edges 9 of the screws preferably project a little beyond the front end of the revoluble cylinder in order to enable the pump to pick up the air more readily.

In Fig. 1 the revoluble cylinder is shown. provided with a pair of screws but any number thereof may be employed such number being regulated according to the capacity of the pump.

The tapering core is provided with a central axle 10, the ends of which are mounted in bearings 11, 12, the latter being secured directly to the flange 3, at the outer end of the stationary casing 1 while the other 11 is preferably secured to a flange 13 on the flared inlet pipe 4 and said flange 13 is then bolted to the flange 2 on the inner end of the casin In order to prevent the air escaping bac r between the casing and the revoluble cylinder, a removable gland 14 is provided at the intake end thereof. Such gland comprises a thin wide ring of rubber or other suitable material 15 which is clamped at its inner edge between a gun-metal ring 16 and a washer or stifiening ring 17 and said gun-metal ring is ada ted to abut against an external collar 18 on tlie intake end of the revoluble cylinder 5. The outer edge of said rubber ring is clamped between the respective flanges 13, 2 of the inlet pipe and the casing. The gun-metal ring 16 fits com aratively loose on the cylinder and when t 1e pump is started the first rush of air passing between the cylinder and casing forces the said ring against the collar 18 and makes an air-tight fit thus reventing air from slipping back to the inta e.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed I declare that what I claim is,

1-. Anim roved pump comprising a revoluble cylin er having one or more internal screws attached to or formed integral therewith, said screw or screws having a gradually increasing pitch from the air intake, a central core formed integral with said screw or spider brackets fixed to the casing and form- 0 screws tapered from the air outlet, an axle on said core journaled in removable bearings on a stationary casin around the cylinder, an inlet pipe attache to said casing and a gland between the latter and said cylinder substantially as set forth.

2. An air pump com risin a rotatable cyL inder, an inner conica core aving helica ly arranged blades connecting the cylinder with the core, the said blades decreasing in depth in the direction of the air current, and the space between the blades decreasing from the inlet to the outlet end of the pump, a casin surrounding the cylinder, and a flexible lan carried by the casing and in contact wit the inlet end of the cylinder.

3. An air pump comprising a stationary casing, a rotatable cylin er Within the same,

ing bearings, a rotatable shaft supported in the bearin s, a conical core mounted on the shaft, bla es helically arranged on the core and having connection with the rotatable cylinder, the pitch of each blade continuously increasin 1n the direction of the air current and the epth thereof gradually diminishing in the same direction, and a flexible gland associated at the inlet end of the pump between the casing and the cylinder.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

JAMES JOSEPH GILDAY.

Witnesses:

EDWARD N. WATERS, WILLIAM H. WATERS. 

